Integrating Chemical Pre-Potassiation with Pre-Modulated KF-Rich Electrolyte Interfaces for Dual-Carbon Potassium Ion Hybrid Capacitor

被引：19

作者：

Qian, Yong ^{[1
]}

Wu, Bei ^{[1
]}

Li, Yang ^{[1
]}

Pan, Zhen ^{[1
]}

Feng, Shuai ^{[2
]}

Lin, Ning ^{[1
]}

Qian, Yitai ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Appl Chem, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

[2] Taishan Univ, Coll Chem & Chem Engn, Tai An 271021, Shandong, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Chemical Pre-Potassiation Strategy; Higher Rate Capability; KF-Rich Electrolyte Interface; Radical Reaction; the Resistance to Electrolyte Oxidation; PRELITHIATION; BATTERIES; ANODE;

D O I：

10.1002/anie.202217514

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Herein, a chemical pre-potassiation strategy via simultaneously treating both glucose derived carbon (GDC) anode and commercial activated carbon (CAC) cathode in potassium-naphthalene-tetrahydrofuran solution is developed for potassium ion hybrid capacitor (PIHC). Combined with in situ and ex situ characterizations, a radical reaction between pre-potassiation reagent and carbon electrodes is confirmed, which not only deactivates electrochemical irreversible sites, but also promotes to pre-form a uniform and dense KF-rich electrolyte film on the electrodes. As a result, the pre-potassiation treatment presents multiple advantages: (I) the initial Coulombic efficiency (CE) of the GDC anode increases from 45.4 % to 84.0 % with higher rate capability; (II) the CAC cathode exhibits the improved cycling CEs and stability due to the enhanced resistance to electrolyte oxidation at 4.2 V; (III) the assembled PIHC achieves a high energy density of 172.5 Wh kg(-1) with cycling life over 10000 cycles.

引用

页数：8